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annotate Lib/IMPL/Web/Handler/ViewSelector.pm @ 272:47db27ed5b43

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author sergey
date Mon, 28 Jan 2013 17:24:37 +0400
parents 3cebcf6fdb9b
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1 package IMPL::Web::Handler::ViewSelector;
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2 use strict;
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3
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4 use IMPL::Const qw(:prop);
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5
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6 use IMPL::declare {
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7 require => {
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8 NotAcceptable => 'IMPL::Web::NotAcceptableException',
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9 HttpResponse => 'IMPL::Web::HttpResponse'
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10 },
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11 base => [
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12 'IMPL::Object' => undef,
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13 'IMPL::Object::Autofill' => '@_',
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14 'IMPL::Object::Serializable' => undef
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15 ],
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16 props => [
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17 views => PROP_RW | PROP_LIST,
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18 fallback => PROP_RW,
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19 types => PROP_RW
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20 ]
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21 };
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22
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23 sub Invoke {
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24 my ( $this, $action, $next ) = @_;
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25
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26 my $result = $next ? $next->($action) : undef;
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27
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28 my $model;
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29
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30 return $result if eval { $result->isa(HttpResponse) };
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31
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32 my $handler;
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33 my $path = $action->pathInfo;
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34
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35 if ( $this->types and $path =~ m/\.(\w+)$/ ) {
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36 my $forced;
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37 if ( $forced = $this->types->{$1} and $action->query->Accept($forced) )
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38 {
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39 ($handler) =
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40 grep eval { $_->can('contentType') }
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41 && $_->contentType eq $forced, $this->views;
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42 }
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43 }
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44
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45 if ( not $handler ) {
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46
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47 my @handlers =
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48 sort { $b->{preference} <=> $a->{preference} } map {
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49 {
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50 handler => $_,
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51 preference => eval { $_->can('contentType') }
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52 ? $action->query->Accept( $_->contentType )
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53 : 0
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54 }
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55 } $this->views;
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56
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57 my $info = shift @handlers;
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58 $handler = $info ? $info->{handler} : undef;
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59
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60 }
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61
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62 die NotAcceptable->new(
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63 map {
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64 eval { $_->can('contentType') } ? $_->contentType : ()
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65 } $this->views
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66 ) unless $handler;
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67
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68 return $handler->Invoke( $action, sub { $result } );
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69 }
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70
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71 1;
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72
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73 __END__
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74
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75 =pod
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76
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77 =head1 NAME
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78
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79 C<IMPL::Web::Handler::ViewSelector> - Выбор нужного представления на основе заголовка C<Accept>
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80
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81 =head1 DESCRIPTION
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82
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83 Использует заголовок запроса C<Accept> для выбора подходящего представления, если задано свойство C<types>,
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84 пытается в первую очередь по расширению определить, какое представление подходит.
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85
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86 В случаях, когда не требуется строить представление для данных (например, при перенаправлении к другому
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87 ресурсу или если нет данных), нужно, чтобы данному обработчику был возвращен
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88 L<IMPL::Web::Application::ActionResult>, который будет просто передан далее.
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89
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90 =head1 MEMBERS
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91
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92 =head2 C<[get,set,list]views>
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93
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94 Список представлений, которые могут быть возвращены.
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95
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96 =head2 C<[get,set]types>
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97
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98 Хеш с соотвествием между расширением и типом содержимого, для подсказки при выборе представления.
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99
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100 =cut